Sadly not an uncommon feature. It is not a ‘change a bulb’ job as it is part of the printed circuit board. If this happens whilst you’re still under warranty, no problem, your supplying dealer will sort this. However , it is still OK to use the motorhome equipment etc.
Some members have had success after checking the connections at the EBL/fuse box and some have had success with a simple switch off and back on re set . Otherwise contact Appuljack who will repair it and EBL boxes if required. APULJACK Electronics LTD